"Green plums hobby-horses"
Refers also to the innocent friendship between a young boy and a girl
Positive
Childhood sweethearts
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《长干行》(Cháng Gān Xíng), a poem by the famous Táng-era (唐, 618 - 907) poet 李白 (Lǐ Bái)
This chengyu is from a line in the work listed in the "Origin" section above